• Code: 6930
• Description: IH related cooling fan motor error
  The alarm signal was detected for 5 seconds continuously during operation.
• Causes: Defective connector cable or poor contact in the connector. Defective cooling fan motor. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Container / IH coil fan motor and relay connector * and engine PWB(YC18) *:Insertion of the above-mentioned relay connector is checked. IH fan motor and engine PWB(YC19)
  Defective cooling fan motor. Replace the container / IH coil fan motor or the IH fan motor.
  Defective PWB. Replace the engine PWB and check for correct operation.

• Code: 6950
• Description: IH CPU communication error
  A communication error is detected 3 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable.
  Defective PWB. Replace the IH PWB or the engine PWB and check for correct operation.

• Code: 6990
• Description: Fuser unit type mismatch problem
  Absence of the fuser unit is detected.
• Causes: Defective PWB.
• Remedy: Replace the IH PWB and check for correct operation.

• Code: 7101
• Description: Toner sensor K error
  The sensor outputs are for 5 seconds, 23 or less, or 248 or more.
• Causes: Defective Developer unit. Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit K.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7102
• Description: Toner sensor C error
  The sensor outputs are for 5 seconds, 23 or less, or 248 or more.
• Causes: Defective Developer unit. Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit C.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7103
• Description: Toner sensor M error
  The sensor outputs are for 5 seconds, 23 or less, or 248 or more.
• Causes: Defective Developer unit. Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit M.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7104
• Description: Toner sensor Y error
  The sensor outputs are for 5 seconds, 23 or less, or 248 or more.
• Causes: Defective Developer unit. Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit Y.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7401
• Description: Developer unit K type mismatch error
  Absence of the developer unit K is detected.
• Causes: Defective connector cable or poor contact in the connector. Different type of the developer unit is installed.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit K and drum connect PWB (YC9) Drum connect PWB and engine PWB (YC4)
  Different type of the developer unit is installed. Install the correct developer unit.